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June 16, 1931. I R. BROWN 1,810,638

ATTACHMENT FOR CALCULATING MACfiINES Filed April 5. 1929 Y 3 Sheets-Sheet 1 :1: In: I

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% ATTORNEY June 16, 1931. L. R. BROWN ATTACHMENT FOR CALCULATING MACHINES Filed April 5, 1929 3 Sheets-Sheet 2 QM QN ,Cy, 3 INVENTOR.

BY 9% W h/ ATTORNEY.

L. R. BROWN June 16, 1931.

ATTACHMENT FOR CALCULATING MACHINES Filed April 5. 1929 3 Sheets-Sheet 3 INVENTOR. (A: 7L Em 8 ATTORNEY.

IIIIIIIIIII Patented June 16, 1931' UNITED STATES PATENT OFFICE I LEE IR. BROWN, 01 EAST. ORANGE, NEW JERSEY, ASSIGNOR TO MONROE CALCULATING MACHINE COMPANY, 01 ORANGE, NEW JERSEY, A CORPORATION OF DELAWARE- ATTACEMENT FOR CALCULATING MACHINES Application filed April 5,

This invention relates to calculating machines, and particularly to calculating machines of the reversible cycle type such as the well known Monroe calculating machine.

The principal object of the invention is to provide a calculating machine of this type with cycle counting devices whereby the total number of cycles of rotation made by the machine in each direction may be separately counted.

Another object of the invention is to provide means whereby a single actuator may be automatically reversed so as to bring it into cooperative relation with either of two cycle counters.

Another object is to provide novel counteractuating mechanism.

Other objects will appear from the following detailed description and claim. I attain all of these objects by means illustrated in the accompanying drawings in which:

Fig. 1 is a diagrammatic top plan view of a machine to which my invention is applicable.

Fig. 2 is a side elevation of the same with parts broken away to show operating parts of the invention.

Fig. 3 is a fragmentary top plan view, partly in section.

Fig. 4 is a sectional view taken substantially on line 44 of Fig. 2.

Fig. 5 isan enlarged ragmenta vertical sectional view looking towards the rlght hand side of the machine and taken substantially on line 55 of Fig. 4.

Fig. 6 is a transverse vertical section taken substantially on line 6-6 of Fig. 5.

Fig. 7 is an exploded perspective view illustrating certain parts of the invention per se.

Like characters of reference refer to like parts in all views.

In the use of reversible cycle calculating machines it is at times desirable toknow the number of cycles of operation that a machine has made in each direction, particularly for test purposes. Counters of this nature are also useful for informing an employer who has a large number of machines in operation, as to the efliciency of the various oper- 1929. Serial No. 352,718.

ators and the amount and type of work begin done on the various machines. Counters in connection with adding machines have been known, but these have generally been for the purpose of counting the number of items entered in the machine or the number of lines printed. Such counters are applied to nonreversible cycle machines and would not serve the purpose here aimed at in connection with reversible cycle machines. And counters in connection with calculating machines have been used for registering multipliers and quotients, but in such counters, a revolution may be registered variously as a unit, ten etc., which would be equall foreign to the present purpose. The di erences between the various types of calculating machines has been clearl brought out in the patent of G. C. Chase, No. 1,566,650, operating means for calculators. The present invention is shown b way of illustration in connection with a onroe calculating machine of the type described in the said Chase patent, and also full set forth in the U. S. a plication of E. F. ritten, J r., Serial No. 332,073, filed February 2, 1929, and entitled Registering mechanism. While the invention is shown as applied to this particular type of machine, this is merely b way of illustration, as it is obvious that with slight variations the invention could be applied to various machines of the reversible cycletype.

Referring to the drawings in detail, 10 represents the casing of the calculating machine. The keyboard frame is shown at 11, and guides a pluralit of manipulative members as follows: digit settin keys 12, zero keys 13, keyboard clearing ey 14, repeat key 15, non-repeat key 16, add operating key or plus bar 17, subtracting operating ke or minus bar 18, division lever 19, multip ierquotient register rotation-reverse shift lever 20,.and multiplying keys 21. A driving motor is shown at 22, an operating crank at 23, and a carriage at 24. The carrige 24 carries a pluralit of accumulators 25, and two sets of multip ier-quotient register indicated at 26 and 27, the registers 26 being of the nineteen-point type (having no carrying mechanism and each bearing the nine significant digits running in reverse directions from a common zero, one set of significant digits being colored differently from the other), and the registers 27 being of the usual ten-point M type with carrying mechanism. The direction actuating devices have not been shown, as

' these are fully described in the said U. S. ap-

plication, Serial No. 377,073, filed February 2, 1929, to which, as well as other disclosures therein referred to, reference may be had for a complete disclosure.

Referring now to Fig. 2, a gear 30 is rotatable in either direction by intermediate connections to the motor 22, the direction of rotation and number of cycles of operation of the samebeing controllable from the keyboard. The gear 30 meshes with a gear 31, and the latter meshes with a ear 32 which may be rotated in either direction at the will of the operator by the handle 23. Thus during either motor-driven or hand-driven operation of the machine, the gear 31 will be rotated, the direction of its rotation being determined by the direction of rotation of the driving gear 30 or 32. The gear 31 makes one complete rotation at each cycle of operation of the machine. With these points in mind, it will be seen that gear 31 forms an ideal operating member for cycle counters.

The gear 31 is secured to a sleeve which is mounted for rotation on a stud 33 secured to a suitable stationary part of the machine framework. The sleeve and gear are retained on the stud by a spring engaging a groove near the outer end of the stud. The inner end of the sleeve is formed eccentric at 34 as shown in Fig. 7 and on its eccentric portion is loosely mounted an actuating member 35 which is curved at 36 at each side and which is formed with an inwardly extending actuator finger 37 at its lower end. The actuating member 35 is free on the eccentric portion 34 but is pressed between a pair of spring washes 38, one of which presses against an annular member 39 secured to for rotation with, the sleeve andwheel 31, and the other of which presses against an annular ring 40 secured to for rotation with the eccentric portion 34. By this means the actuator 35 is frictionally connected to the wheel 31 so as to rotate therewith within certain limits, the limiting means being hereinafter described. It will be understood that with the construction and arrangement described, if-the actuator 35 is held against rotation and wheel 31 is rotated the actuator will be reciprocated by action of the eccentric 34.

A plate 41 is secured to a suitable part of the-framework of the machine below the axis of wheel 31 and carries a pair of limiting lugs 42 and 43 which extend towards the right and inside of the machine and at opposite sides of the vertical plane of the axis of Wheel 31. The member 35 extends downwardly between the lugs 42 and 43 and is limited in its rotary movement by said lugs. The distance between the lugs 42 and 43 is just sufficient to permit actuator 35 to move its finger 37 into cooperative relationship with either of a pair of ratchet Wheels 44 and 45, the ratchet wheel 44 being for effecting counting of adding cycles and the ratchet 45 for effecting counting of subtracting cycles. It might be noted that multiplication is performed by a plurality of adding cycles and division by a plurality of subtracting cycles as is well known in the art.

\Vhen addition or multiplication is being performed the gear 31 will be driven counterclockwise as viewed in Fig. 2, and williirst carry the actuator 35 into engagement with the lug 42. After the actuator 35 has been stopped by lug 42, the wheel 31 will continue its counter-clockwise rotation and the eccentric 34 will reciprocate the actuator 35 cans ing its finger 37 to engage one of the teeth of the ratchet wheel 44 and rotate the ratchet Wheel one step or tooth. As the actuator 35 moves downward for actuating the ratchet it is kept constantly ressed against the lug 42, and its curved sur ace 36 riding along the lug 42 causes the actuator 35 to have a very slight further rotary and rocking movement which brings it into correct engagement with the tooth of gear 44. As the operation continues the eccentric passing over to the rear side of the center causes a slight clockwise rock-' ing movement of actuator 35 about the lug 42 as a fulcrum, so as to prevent the tooth 37 from pressing against the ratchet Wheel while being retracted to its upper position; and such movement of the tooth 37 is further accentuated by the co-action of the curved face 36 and the lug 42.

When subtraction or division is to be performed, thegear 31 is turned clockwise as viewed in Fig. 2, and the actuator 35 is carried over against the lug 43, and is then depressed by the eccentric and retracted, the tooth 37 co-operating during this cycle with a tooth of the ratchet wheel 45 so as to turn this ratchet wheel one tooth or step.

The plate 41 is U-shaped in constructid;

bearings in the upright ortion of the U- shaped member 41, one o the shafts carr ing the addition ratchet wheel 44 and the other the substraction ratchet wheel 45. Operation of the ratchet wheel 44 effects operation of the adding counter 46 through the respective shaft, worm, and worm gear, while operation of the ratchet wheel 45 effects operation of the subtracting counter 47 by means of the respective train of mechanism therebetween. The base of the machine, as shown in Fig. 4, is provided with apertures 51 opposite the counters 46 and 47, and formlng windows through which the counters may be read.

It will be understood, of course, that the counters could be operated directily from the actuator 35, but in order to use small counters the capacity of the counters is increased by utilizing reduction gearing as shown, and any desired ratio of reduction may be used so that a single digit appearing on a counter may represent ten or one hundred or one thousand cycles, accordin to'the construction desired and incorporated in the machine.

From the above description it will be seen that the invention as provided, is a simple means whereb a single actuator may be automatically shif ted and rotated so as to count separately the additive and subtractive cycles of a reversible cycle calculating machine on two separate counters.

While I have described what I consider to be the most desirable embodiment of my invention, it is obvious that many chan es could be made without departing from t e spirit of my invention, and I, therefore, do not limit myself to the exact construction shown, or to anything less than the whole of my invention as hereinbefore described, and as ereinafter claimed.

I claim:

The combination of a reversible cycle calculatin'g mechanism including a gear rotatable in either direction, an element mounted eccentric to the axis of said gear and o erable by said gear, an actuator on said e eme'nt, means for clutching said actuator to said gear, cycle counters operable by said actuator, and means for limiting the amount of move ment of said actuator effected by the action of the clutching means.

In testimony whereof I aflix m s1 ature. LEE R. 11 

